Dad and I just went out to see a few old Cyclones and other bikes. Grandpa was the draftsman for the Cyclone company. Here is one, fully restored and looking great. They made around 300, 12 are know to exist today, some in the race version, some in the street version. And yes, it is in the guy's dining room.
Also an old pic from the track, and one of the road bikes.
This engine was cutting edge in the teens, it was the pioneer in overhead cam cycle engines. Driveshafts and bevel gears are in the tubes to run the cams where other bikes had pushrods and rocker arms in the same locations. Cyclones kicked a** on board and dirt tracks.